Tightness during Post-tanning
Obtaining a tight grain while maintaining all aesthetic and functional characteristics may be difficult enough, to reduce the rejection rate by a small percentage only may seem impossible. To achieve this, factors influencing grain tightness need to be understood. Improving on tightness, in most cases, means an increase in cutting yield and thus a higher profit.
For this SmiTools the focus is on the influence of post-tanning processing. The various influences of the previous steps are too varied to discuss in a general way. Moreover, a lot of crust is made from wetblue of outside origin. Where it comes from and how it was made is not always known and the material available needs to be taken as a given fact.
Retanning and fatliquoring processes need to be developed for the leathers available under consideration of their peculiarities.
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Learn about the many different parameters that influence good, waterproof leather. Making leather waterproof contains more than just choosing the right fatliquor (this is actually the easiest part). The key lies in the right processes such as running times, temperature control, washing and polyvalent metal fixing.
In this SmiTools episode, Smit & zoon shares a synopsis on the topic ‘Strength Properties’. Learn about the different ways to measure leather strength (e.g. tear strength, tensile strength), the causes of strength loss, and remedies to reduced leather strength.